Gutzwiller variational wave function for multi-orbital Hubbard models in finite dimensions
Kevin zu M\"unster, J\"org B\"unemann
TL;DR
This paper introduces a diagrammatic method to evaluate multi-band Gutzwiller wave functions in finite dimensions, improving upon existing approximations, and applies it to study ferromagnetism and Fermi surface deformations in a two-band Hubbard model.
Contribution
A systematic diagrammatic approach for multi-band Gutzwiller wave functions in finite dimensions, enhancing the accuracy over traditional Gutzwiller approximation.
Findings
Analysis of itinerant ferromagnetism in the two-band Hubbard model
Observation of correlation-induced Fermi surface deformations
Demonstration of the method's systematic improvement over existing approximations
Abstract
We develop a diagrammatic method for the evaluation of general multi-band Gutzwiller wave functions in finite dimensions. Our approach provides a systematic improvement of the widely used Gutzwiller approximation. As a first application we investigate itinerant ferromagnetism and correlation-induced deformations of the Fermi surface for a two-band Hubbard model on a square lattice.
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